ETH_RSS_IP only does not seem to balance traffic

[Yasuhiro Ohara]

That makes sense. Thank you.
It would be great to have further comments from the maintener.

For the RTE framework integrity, would it be better for us
to have a consistent meaning for the ETH_RSS_XXX flags?
Do the other drivers act differently?

Best regards,
Yasu

From: Bruce Richardson <bruce.richardson at intel.com>
Subject: Re: ETH_RSS_IP only does not seem to balance traffic
Date: Thu, 13 Jan 2022 15:05:53 +0000
Message-ID: <YeA/0SQjcKJpCBu9 at bricha3-MOBL.ger.corp.intel.com>

> On Thu, Jan 13, 2022 at 12:52:04AM +0900, Yasuhiro Ohara wrote:
>> 
>> Hi,
>> 
>> My system developper friend recently ran into a problem where
>> l3fwd does not appear to receive balanced traffic on Intel XL710,
>> but it is resolved when the attached patch is applied.
>> 
>> -            .rss_hf = ETH_RSS_IP,
>> +            .rss_hf = ETH_RSS_IP | ETH_RSS_TCP | ETH_RSS_UDP,
>> 
>> IIRC I ran into a similar problem 3 or 4 years back,
>> but didn't report then because I believed I was doing something silly.
>> But since my friend is an experienced engineer, I feel like
>> it may be better (for the community) to ask this in the list.
>> 
>> We are using dpdk-stable-18.11.6 and igb_uio.
>> 
>> What are we doing wrong?
>> 
>> If it is not a FAQ, I can test it again with more recent stable,
>> and will report the details.
>> 
> For XL710 NICs, I believe that ETH_RSS_IP load balances only IP frames that
> do not have TCP or UDP headers also. Adding i40e driver maintainer on CC
> to comment further.
> 
> /Bruce
>